Part 7: Additional Rent – Common Area Maintenance Costs. Common Area Maintenance costs (generally known as “CAM”), should be one of the most negotiated areas of a commercial lease as so many factors and positions come into play which will vary according to the make-up of each commercial project. A tenant needs to be wary that its Landlord is not using CAM costs as potential profit center for the management, operation and maintenance of its commercial project. Likewise, a tenant [...]